High speed multi-cylinder machine for manufacturing a multi-ply paper

ABSTRACT

A high speed, multi-cylinder arrangement for manufacturing multi-ply paper includes units each having a wire cylinder encircled in part by an endless wire screen which, in turn, is encircled in part by an endless felt. Stock is supplied onto the endless wire screen and into a sheet forming zone between the wire screen and the felt. A suction slider is located adjacent the location of the separation of the wire screen from the wire cylinder. Downstream of the suction slider, a suction box is provided for holding paper to the felt as the felt and wire screen are separated.

United States Patent Tokuno Dec. 2, 1975 HIGH SPEED MULTI-CYLINDER MACHINE 3,671,388 6/1972 Nykopp 162/318 x FOR MANUFACTURING A MULTI'PLY FOREIGN PATENTS OR APPLICATIONS PAPER 850,364 9/1970 Canada 162/300 [75] Inventor: Masateru Tokuno, Nishinomiya, 45-14128 5/1970 Japan Japan 37-5805 6 1962 Japan 162/318 [73] Assignee: shlzuoka-Kogyo Co., Ltd., Japan Primary Emminer s. Leon Bashore [22] Filed: Apr. 19, 1974 Assistant Examiner-Richard V. Fisher 1 W pp NO: 462,260 Attorney, Agent, or Firm Brugess Ryan and ayne Related U.S. Application Data 57 ABSTRACT [63] Continuation of Ser. No. 74,302, Sept. 22, 1970, A high Speed, multi cylinder arrangement for manu abandoned facturing multi-ply paper includes units each having a wire cylinder encircled in part by an endless wire [52] U.S. C1. 162/300, 162/304, 11662433168; Screen which in tum, is encircled in part by an less felt. Stock is supplied onto the endless wire screen [51] l GL2 DZIF 1 H08 and into a sheet forming zone between the wire screen [58] Field of Search 162/300, 301, 303, 304, I

162/318 133 363 364 368 DIG 7 306 203 and the felt. A suct1on sllder is located ad acent the location of the separation of the wire screen from the wire cylinder. Downstream of the suction slider, a suc- [56] References Cited tion box is provided for holding paper to the felt as the UNITED STATES PATENTS felt and wire screen are separated. 3,201,305 8/1965 Webster 162/318 x 4 Cl 4 D 3,565,757 2/1971 Jordansson 162/317 x 'awmg gums VACUUM SUPPLY IOO VACUUM SUCTION SUPPLY US. Patent Dec. 2, 1975 Sheet 1 of2 3,923,595

SUPPLY VACUUM US. Patent Dec. 2, 1975 Sheet 2 of2 3,9235595 HIGH SPEED MULTl-CYLINDER MACHINE FOR MANUFACTURING A MULTI-PLY PAPER This is a continuation of application Ser. No. 74,302, filed Sept. 22, I970, now abandoned.

BRIEF SUMMARY OF THE INVENTION The present invention relates to an improved high speed multi-cylinder machine for manufacturing a multi-ply paper.

Generally, in the case of using a high speed multi-cylinder machine wherein each cylinder part is provided with a wire screen arranged above a felt and the wire screen forms a comparatively short passage so that forming of sheet is carried out upon the wire screen, it is inevitable that water content of the sheet is lowered so that clinging of fibers between sheets is weakened, that is, clinging force between sheets is weakened.

On the other hand, in the case of using a multi-cylinder machine wherein each cylinder part comprises a wire cylinder and a flow box disposed above the wire cylinder in such a way that a bottom aperture thereof faces the wire cylinder and an endless felt or wire screen encircles a part of the wire cylinders bottom portion by way of a guide roller and a couch roll so that stock is fed into a space between the wire cylinder and the felt or wire screen and a continuous sheet formed during carrying with the wire cylinder and the felt or wire screen is picked off from the felt at a position of the couch roll, since accumulated water in the wire cylinder is ejected toward the wet sheet by the action of centrifugal force, the structure of the wet sheet may be damaged.

The principal object of the present invention is to provide an improved high speed multi-cylinder machine for manufacturing a multi-ply paper, which solves the above-mentioned troubles.

In each cylinder part of the high speed multi-cylinder machine according to the present invention, a wire cylinder is partly encircled by an endless wire screen by way of a pair of guide or wire rollers, a flow box is disposed above an upper horizontal passage of the wire sheet in such a way that a bottom aperture thereof closely faces the upper horizontal passage of the wire screen. A feed roller is disposed above the wire cylinder with a preferable distance from the bottom aperture of the flow box. A couch roller is disposed closely below the wire screen at an adjacent position of an outgoing nip between the wire cylinder and the wire sheet in such a way that the couch roll presses against the wire cylinder. An endless felt is guided by the feed roller and the couch roll so that the felt closely encircles the contact position of the wire screen with the wire cylinder. Consequently, stock is successively deposited on the wire screen at its horizontal passage and carried to the ingoing nip between the wire screen and the felt while forming a sheet, and then the sheet containing water is sandwiched with pressure by the felt and the wire screen while being carried from the above-mentioned ingoing nip and outgoing nip between the felt and the wire screen which coincides with a working position of the couch roll. A suction slider is closely disposed above the wire screen at the outgoing nip. In accordance with the above-mentioned carrying motion of the sheet, the water is extracted from the sheet at the above-mentioned outgoing nip by the couch roller and the suction slider. Further, the sheet is carried with the felt by applying suction force by the suction box. A plurality of cylinder parts having the abovementioned members are successively arranged by way of utilizing a common endless felt. Therefore, a multi-ply paper made of stock supplied from the flow boxes can be made at a high speed with desirable clinging between sheets from a plurality of stock and with uniform density of fibers. In other words, a rnulti-ply paper having an excellent quality can be produced.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING FIG. 1 is a schematic diagram of a multi-cylinder machine, partly omitted, according to the present invention,

FIG. 2 is a schematic side view of each unit of the cylinder part, of the machine shown in FIG. 1,

FIG. 3 is a schematic side view of a first cylinder part of the machine shown in FIG. 1,

FIG. 4 is an explanatory side view of mid and outgoing nips of a further cylinder part of the machine shown in FIG. 1.

DETAILED DESCRIPTION Referring to FIG. 1, a multi-cylinder machine according to the present invention is provided with a plurality of cylinder parts, each part comprises a wire cylinder l and an endless wire screen 11. The wire screen 11 partly encircles the wire cylinder 1 and is guided by a pair of wire or guide rollers 6 and 10. Tension of the wire screen 11 is adjusted by a tension roller 9. A clearer roller 8 is rotatably contacted with the outside surface of the wire screen 11 at an intervened position between the wire roller 6 and the tension roller 9. An endless felt 13 is guided by a feed roller 4 and a guide roller 14 and also a couch roller 5 so that the contact portion of the wire cylinder 1 with the wire screen 1 1 is closely encircled by the felt 13 as shown in the drawing. The couch roll 5 is positioned at a position below the outgoing nip between the wire cylinder 1 and the wire screen 11 so that the portion of felt 13 which encircles the wire screen 11 and the wire roller 1 is defined. A passage of the wire screen 11 above the wire cylinder 1 is almost horizontal, and a flow box 2 is disposed above the horizontal portion of the wire screen 11 in such a way that a bottom aperture 3 of a flow box 2 adjacently faces the wire screen. It is preferable that the bottom aperture 3 faces the ingoing nip between the felt l3 and the wire screen 11 above the wire cylinder 1. The wire cylinder 1 is driven with the wire screen 11 and the felt 13 toward a direction represented by an arrow by means of a driving means (not shown). A suction slider 12 supplied with suction power by vacuum supply is disposed at an adjacent position to the outgoing nip between the wire cylinder 1 and the wire screen 1 1 and a suction box 7 is disposed below the felt 13 at an adjacent position to the outgoing nip between the felt 13 and the couch roll 5. The position of the flow box 2 can be adjusted so as to change along the passage of the wire screen 11 while the position of the feed roller 4 can also be adjusted along a direction toward the bottom aperture 3 of the flow box 2 so that a space adjacent to the ingoing nip between the felt 13 and the wire screen 11 can be adjusted. In the above-mentioned embodiment of the present invention, the endless felt 13 is commonly used for each cylinder part so that a continuous sheet sandwiched by the felt l3 and the wire screen 11 is carried with them while these members encircle the wire cylinder 1. At the outgoing nip, since a suction aperture of the suction slider 12 closely faces the wire screen 11, water contained in the sheet is sucked into the suction slider 12 while the sheet is carried with the felt 13 by a suction force of the suction box 7 when the sheet leaves the outgoing nip between the couch roller and the wire cylinder 1, preventing the sheet from being carried with the wire screen 11. As already illustrated, the endless felt 13 is next driven to the feed roller 4 of the next cylinder part having the same construction as that of the previous one and finally driven to a pair of suction rollers 15 and 16, so that water contained in the felt 13 is removed, and then the felt is returned to the feed roller 4 of the first cylinder part by way of a plurality of guide rollers 14. The suction roller 15 is belted with a top felt 18. A pair of shower nozzles 19 and 20 are disposed adjacently to the wire screen 19 and the wire cylinder 1 as shown in FIG. 2 and a doctor 21 is disposed so as to contact with the clearer roller 8 in order to remove waste from the roller 8 when waste is carried with the wire screen 11 and wound about the roller 8. A saveall 22 is disposed below the clearer roller 8 to receive the waste removed from the clearer roller 8.

When stock is continuously deposited upon the wire screen 11 from the flow box.2 while driving the wire screen 11 and the endless felt 13 at the same running speed, the stock flows freely toward the ingoing nip between the wire screen 11 and the endless felt 13 and a small quantity of water contained in the stock passes through the wire screen 1 1 so that the water adheres to the wire cylinder 1. The stock fed into a space between the wire screen 11 and the endless felt 13 is pressed by pressure of the felt 13, which is created by the driving tension thereof. Consequently, a continuous sheet of fibers (hereinafter referred to as a sheet) is formed while being carried with the wire screen 11 and the felt 13 which are running at the same speed. Water contained in the sheet partly passes through the wire screen 11 and enters the wire cylinder 1 while the sheet is being carried with the wire screen 11 and the felt 13. However, the water entering into thewire cylinder 1 adheres to the inside surface thereof by action of centrifugal force created by a high speed rotation of the cylinder 1. On the other hand, a part of the water contained in the sheet is absorbed into the felt 13. By the above-mentioned operation, a wet paper-like sheet P is created. In other words, the stock supplied into the space between the wire screen 11 and the endless felt 13 is formed firstly into a continuous sheet and rapidly changed into a wet paper-like sheet P while being carried with the wire screen 1 1 and the felt 13. At the outgoing nip of these members, the couch roller 5 presses the wet paper-like sheet P together with the wire screen 11 and the felt 13 towards the wire cylinder 1 so that water remaining in the sheet P is further squeezed and the squeezed water drops from the couch roller or enters into the wire cylinder 1 through the wire screen 11. Water entering into the wire cylinder 1 is ejected outside of the cylinder 1 and sucked into the suction slider 12 when the sheet P is delivered from the outgoing nip and carried with the felt 13 in accordance with the suction force of the suction box 7. To attain the abovementioned suction effect of the suction slider 12, the suction aperture thereof faces a tangential direction of the wire cylinder 1 with respect to the outgoing nip. After completion of the above-mentioned operation, the sheet P is carried to the following cylinder part together with the felt 13.

Referring to FIG. 4 which illustrates a second cylinder part, continuous supply of stock upon the running wire screen is similarly carried out as in the first cylinder unit. For the convenience of illustration, members of the second cylinder part are primed. In this embodiment, the supplied stock upon the second wire screen 11 has a similar fiber density as that of stock prepared in the second flow box 2. Since the sheet P is carried from the first cylinder part and passes to the second cylinder part with the felt 13, the stock supplied from the second flow box 2 flows to an ingoing nip between the second wire screen 11 and the sheet P and then a fresh sheet P is formed between the second wire screen 11 and the sheet P while being carried with the second wire screen 11, the sheet P and felt 13. Since the fresh sheet P contains water, a part of the water is squeezed from the fresh sheet P while being carried with the second wire screen 11 and the sheet P and the felt 13 so that the squeezed water passes the second wire screen 11 and enters into the wire cylinder. On the other hand, a part of the water squeezed from the fresh sheet P penetrates into the sheet P and the felt 13. By the above-mentioned carrying operation of the fresh sheet P with the sheet P, surface fibers of the fresh sheet P cling to surface fibers of the sheet P so that these sheets P and P are joined together as a continuous two-ply sheet. This two-ply sheet is delivered from the outgoing nip between the second wire screen 11 and the felt 13 at the position where the second couch roller 5 is rotatably urged to the wire cylinder 1 As already illustrated in the case of the first cylinder unit, water, which is squeezed from the fresh sheet P and enters into the second wire cylinder 1, is ejected from the second wire cylinder 1, towards the suction aperture of the second suction slider 12, and water, which penetrates into the sheet P and the felt 13, is squeezed by the couch roller 5', while the two-ply sheet is carried with the felt 13 by aid of the suction force of the second suction box 7.

A plurality of the above-mentioned sheet forming operations can be repeated so that a multi-ply sheet is formed. And finally, water is further extracted from this multi-ply sheet when the multi-ply sheet passes through the nip between the top felt 18 and the suction roller 16. Then, the sheet is carried to the nip between the top felt 18 and the press roller 17 so that the multiply sheet is carried to the following process. On the other hand, the felt 13 is carried to the feed roller 4 of the first cylinder unit by way of a plurality of guide rollers 14.

In the above-mentioned process, the distance between the bottom aperture 3 of the flow box 2 and the feed rollers 4 may be adjusted or an entrance space before the ingoing nip between the felt 13 and the wire screen 11 may be also adjusted, in accordance with the fiber density of the stock.

In the case of driving the members of the cylinder parts at very high speed of more than 500 m/min the contact pressure between the wire cylinder 1 and the wire screen 11 together with the felt 13 tends to decrease because of centrifugal force thereof. To preventthe above-mentioned decrease of the contact pressure a vacuum suction means may be connected with the sheet produced in the previous cylinder part is fed with the felt 13. When parts of the sheet adhere to the wire screen 11 at the outgoing nip and are carried by the wire screen 11, parts of the sheet are wound about the clearer roller 8 and removed from the clearer roller 8 by means of the doctor 21 so that the removed substance is dropped into the save-all. Consequently, the wire screen 11 can always be maintained in a clean condition.

As already illustrated, in the multi-cylinder machine of the present invention, there are several characteristic features, that is, when the stock deposited upon the wire screen is carried to the ingoing pin above the wire cylinder 1, since the distance between the bottom aperture 3 of the flow box 2 and the ingoing nip is sufficient to distribute fibers in the stock uniformly along the wire screen 11, the fibers in the stock are entangled with each other so that sheet having a strong configuration can be created. The stock fed into the ingoing nip contains a similar quantity of water to that of the stock because a very small quantity of water is only removed from the stock deposited upon the wire screen until the stock is carried to the ingoing nip. Therefore, formation of sheet is carried out uniformly at the zone of sheet formation between the ingoing and outgoing nips. Further, water removed from the sheet and entered into the wire cylinder 1 is sucked into the suction aperture of the suction slider 12 at the adjacent position of the outgoing nip so that it is prevented from damaging the sheet by the running water from the wire cylinder 1. Since the sheet formation is carried out with pertinent pressure between the wire screen 11 and the felt 13 while containing water in the sheets at the process after the first cylinder part, binding of a fresh sheet with a sheet carried from a previous cylinder part is strongly attained even though the running speed of the members of each cylinder part is very high, more than 500 m/min.

What is claimed is:

1. High speed multi-cylinder arrangement for manufacturing multi-ply papers comprising a plurality of cylinder parts, each cylinder part comprising a wire cylinder having an upper section and a lower section and rotating at a high speed, an endless wire screen first making contact with said wire cylinder at said upper section and encircling a part of said wire cylinder and separating from contact with said wire cylinder at said lower section, an endless felt encircling said endless wire screen at said part of said wire cylinder so that said endless wire screen and said felt form a sheet forming zone therebetween, said wire screen and felt moving at the same running speed as said wire cylinder, tension means for contacting said wire screen with said wire cylinder under pressure, means for guiding said felt so that part of said wire cylinder is encircled with said felt and said felt is urged toward said wire screen under pressure, a flow box disposed above said wire screen and provided with a bottom aperture to deposit stock upon said wire screen, said fiow box being located above said wire screen at a predetermined distance from an ingoing nip of said sheet forming zone, said wire screen being carried along a horizontal passage between a position below said flow box and said ingoing nip, a couch roller disposed below said wire cylinder, said couch roller being urged toward said wire cylinder to press said felt and wire screen against said wire cylinder, first and second roll means spaced from said couch roller, said screen extending from said lower section of said wire cylinder around said first roll means whereby said first roll means determines the location of separation of said screen from said wire cylinder, said felt extending from said sheet forming zone at said couch roller to said second roll means whereby said second roll means determines a location of separation of said felt and screen at said couch roller, a suction slider located adjacent said lower section of said wire cylinder between a surface of said wire cylinder and said wire screen adjacent said location of separation of said screen from said wire/cylinder, said suction slider having a suction aperture facing in the tangential direction of said wire cylinder at said location of separation of said screen from said wire cylinder to draw water from within said wire cylinder, means connected to said suction slider for applying suction thereto, and a suction box disposed adjacent said couch roller downstream of said location of separation of said felt from said screen, said suction box located below said felt and below said wire screen closely downstream of said suction slider, said suction box provided with a suction aperture closely facing the underside of said felt for holding paper formed between said felt and wire screen to said felt at said location of separation of said felt from said screen.

2. High speed multi-cylinder arrangement according to claim 1, further comprising a clearer roller contacting said wire screen at a position above said suction slider, said clearer roller provided with a doctor in continuous contact therewith, and a save-all disposed below said clearer roller to receive waste removed from said clearer roller.

3. High speed multi-cylinder arrangement according to claim 1, wherein said guide means of said felt comprises a feed roller disposed at said ingoing nip position.

4. High speed multi-cylinder according to claim 1, wherein the interior of said wire cylinder is connected to a vacuum means. 

1. HIGH SPEED MULTI-CYLINDER ARRANGEMENT FOR MANUFACTURING MULTI-PLY PAPERS COMPRISING A PLURALITY OF CYLINDER PARTS, EACH CYLINDER PART COMPRISING A WIRE CYLINDER HAVING AN UPPER SECTION AND A LOWER SECTION AND ROTATING AT A HIGH SPEED, AN ENDLESS WIRE SCREEN FIRST MAKING CONTACT WITH SAID WIRE CYLINDER AT SAID UPPER SECTION AND ENCIRCLING A PART OF SAID WIRE CYLINDER AND SEPARATING FROM CONTACT WITH SAID WIRE CYLINDER AT SAID LOWER SECTION, AN ENDLESS FELT ENCIRCLING SAID ENDLESS WIRE SCREEN AT SAID ART OF SAID WIRE CYLINDER SO THAT SAID ENDLESS WIRE SCREEM AND SAID FELT FROM A SHEET FORMING ZONE THEREBETWEEN, SAID WIRE SCREEN AND FELT MOVING AT THE SAME RUNNING SPEED AS SAID WIRE CYLINDER, TENSION MEANS FOR CONTACTING SAID WIRE SECEEN WITH SAID WIRE CYLINDER UNDER PRESSURE, MEANS FOR GUIDING SAID FELT SO THAT PART OF SAID WIRE CYLINDER IS ENCIRCLED WITH SAID FELT AND SAID FELT IS URGED TOWARD SAID WIRE SCREEN UNDER PRESSURE, A FLOW BOX DISPOSED ABOVE SAID WIRE SCREEN AND PROVIDED WTH A BOTTOM APERTURE TO DEPOSIT STOCK UPON SAID WIRE SCREEN SAID FLOW BOX BEING LOCATED ABOVE SAID WIRE SCREEN AT A PREDETERMINED DISTANCE FROM AN INGOING NIP OF SAID SHEET FORMING ZONE, SAID WIRE SCREEN BEING CARRIED ALONG A HORIZONTAL PASSAGE BETWEEN A POSITION BELOW CARRIED BOX AND SAID INGOING NIP, A COUCH ROLLER DISPOSED BELOW SAID WIRE CYLINDER, SAID COUCH ROLLER BEING URGED TOWARD SAID WIRE CYLINDER TO PRESS SAID FELT AND WIRE SCREEN AGAINST SAID WIRE CYLINDER, FIRST AND SECOND ROLL MEANS SPACED FROM SAID COUCH ROLLER, SAID SCREEN EXTENDING FROM SAID LOWER SECTION OF SAID WIRE CYLINDER AROUND SAID FIRST ROLL MEANS WHEREBY SAID FIRST ROLL MEANS DETERMINES THE LOCATION OF SEPARATION OF SAID SCREEN FROM SAID WIRE CYLINDER, SAID FELT EXTENDING FROM SAID SHEET FORMING ZONE AT SAID COUCH ROLLER TO SAIID SECOND ROLL MEANS WHEREBY SAID SECOND ROLL MEANS DETERMINES A LOCATION OF SEPARATION OF SAID FELT AND SCREEN AT SAID COUCH ROLLER, A SUCTION SLIDER LOCATED ADJACENT SAID LOWER SECTION OF SAID WIRE CYLINDER BETWEEN A SURFACE OF SAID WIRE CYLINDER AND SAID WIRE SCREEN ADJACENT SAID LOCATION OF SEPARATION OF SAID SCREEN FROM SAID WIRE/CYLINDER, SAID SUCTION SLIDER HAVING A SUCTION APERTURE FACING IN THE TANGENTIAL DIRECTION OF SAID WIRE CYLINDER AT TION SLIDER LOCATED ADJECENT SAID LOCATION OF SEPARATION OF SAID DER TO DRAW WATER FROM WITHIN SAID WIRE CYLINDER, MEANS CONNECTED TO SAID SUCTION SLIDER FOR APPLYING SUCTION THERETO, AND A SUCTION BOX LOCATED BELOW SAID FELT AND BELOW SAIID WIRE SCREEN OF SAID LOCATION OF SEPARATION OF SAID FELT FROM SAID SCREEN, SAID SUCTION BOX LOCATED BELOW SAID FELT AND BELOW SAID WIRE SCREEN CLOSELY DOWNSTREAM OF SAID SUCTION SLIDER, SAID SUCTION BOX PROVIDED WITH A SUCTION APERTURE CLOSELY FACING THE UNDERSIDE OF SAID FELT FOR HOLDING PAPER FORMED BETWEEN SAIID FELT AND WIRE SCREEN TO SAID FELT AT SAID LOCATION OF SEPARATION OF SAID FELT FROM SAID SCREEN.
 2. High speed multi-cylinder arrangement according to claim 1, further comprising a clearer roller contacting said wire screen at a position above said suction slider, said clearer roller provided with a doctor in continuous contact therewith, and a save-all disposed below said clearer roller to receive waste removed from said clearer roller.
 3. High speed multi-cylinder arrangement according to claim 1, wherein said guide means of said felt comprises a feed roller disposed at said ingoing nip position.
 4. High speed multi-cylinder according to claim 1, wherein the interior of said wire cylinder is connected to a vacuum means. 